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183_notes:friction [2021/02/18 21:21] – [Forces due to contact] stumptyl | 183_notes:friction [2021/02/18 21:23] (current) – [Friction] stumptyl | ||
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===== Forces due to contact ===== | ===== Forces due to contact ===== | ||
- | When two objects are in contact, their contact surfaces exert forces on each other. This is quite different from the gravitational force because while it acts on every piece of mass, as you will learn, | + | When two objects are in contact, their contact surfaces exert forces on each other. This is quite different from the gravitational force because while it acts on every piece of mass, as you will learn,__ //_we consider that it acts at the [[http:// |
For contact forces, (for a time) you will continue to use the assumption that we can just consider whether a contact force acts or not (And in what direction it acts). In the future, you might need to know precisely where it acts because [[183_notes: | For contact forces, (for a time) you will continue to use the assumption that we can just consider whether a contact force acts or not (And in what direction it acts). In the future, you might need to know precisely where it acts because [[183_notes: | ||
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[{{ 183_notes: | [{{ 183_notes: | ||
- | Friction is a resistive force that is due the contact between two objects. While the normal force is perpendicular to the contact surfaces, the frictional force is parallel. So, the vector sum of these two forces (when both are acting) is the force that the surface exerts on the object. That is, both the normal and frictional forces are due to the same contact interactions, | + | Friction is a resistive force that is due the contact between two objects. |
[{{183_notes: | [{{183_notes: |